treewide: Make explicit that 'dev' output of libssh2 is used

pkgs/servers/monitoring/zabbix/2.2.nix

@@ -46,7 +46,7 @@ in
     ]
     ++ stdenv.lib.optional enableJabber "--with-jabber=${minmay}"
     ++ stdenv.lib.optional enableSnmp "--with-net-snmp"
-    ++ stdenv.lib.optional enableSsh "--with-ssh2=${libssh2}"
+    ++ stdenv.lib.optional enableSsh "--with-ssh2=${libssh2.dev}"
     ++ stdenv.lib.optional enableLdap "--with-ldap=${openldap}";
 
     postPatch = ''

pkgs/tools/networking/curl/7.15.nix

@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
   configureFlags = [
       "--with-ca-bundle=/etc/ssl/certs/ca-certificates.crt"
       ( if sslSupport then "--with-ssl=${openssl}" else "--without-ssl" )
-      ( if scpSupport then "--with-libssh2=${libssh2}" else "--without-libssh2" )
+      ( if scpSupport then "--with-libssh2=${libssh2.dev}" else "--without-libssh2" )
     ]
     ++ stdenv.lib.optional c-aresSupport "--enable-ares=${c-ares}"
     ++ stdenv.lib.optional gssSupport "--with-gssapi=${gss}"

pkgs/tools/networking/curl/default.nix

@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
       "--with-ca-bundle=/etc/ssl/certs/ca-certificates.crt"
       "--disable-manual"
       ( if sslSupport then "--with-ssl=${openssl}" else "--without-ssl" )
-      ( if scpSupport then "--with-libssh2=${libssh2}" else "--without-libssh2" )
+      ( if scpSupport then "--with-libssh2=${libssh2.dev}" else "--without-libssh2" )
       ( if ldapSupport then "--enable-ldap" else "--disable-ldap" )
       ( if ldapSupport then "--enable-ldaps" else "--disable-ldaps" )
       ( if idnSupport then "--with-libidn=${libidn.dev}" else "--without-libidn" )